Add Codex repo-specific tracking structure

Codex/Agent/CURRENT_STATE.md

@@ -0,0 +1,36 @@
+# Agent — Current State
+
+This file records what is believed to be implemented now.
+
+## Lifecycle / readiness
+- readiness-aware server start is centralized.
+- manual start/restart, autostart, and supervisor crash restart use the same readiness-aware path.
+- duplicate/dead crash monitor path was removed.
+- `/ready` exists and is the semantic readiness gate.
+- `/status` includes operation and maintenance state fields.
+- guarded operation locking exists for mutating/stateful flows.
+
+## Control hardening
+- `/start`, `/stop`, `/restart` are POST-only.
+- `/console/command` is POST-only and JSON-based with validation/limits.
+
+## Backup support
+- local Minecraft backups exist for:
+  - create
+  - list
+  - restore
+  - delete
+- backups are local under `/opt/zlh-agent/backups`.
+- retention is currently simple local max-count pruning.
+- pre-restore checkpoint hardening has been added so restore creates a safety checkpoint before destructive restore begins.
+- restore exposes both restored backup metadata and checkpoint metadata.
+
+## Runtime / dev environment base
+- runtime installs are artifact-backed.
+- dev user/workspace model exists.
+- code-server install/start baseline exists.
+
+## Important boundary
+- agent does not own remote/offsite backup syncing.
+- local app-aware backups are agent responsibility.
+- PBS / platform backup strategy is separate from agent implementation.